the temp indoor says 78 but the ac temp says 72 . is something wrong

Please verify you are using a high quality standard alkaline battery and try the troubleshooting steps listed below. If this does not correct the issue, please contact the AcuRite Support Team via Live Chat. We are happy to assist you. Hard Reset -Remove batteries from both units -Place batteries in the sensor first -Place batteries in the display, let the two units sit side by side until you read outdoor information -Wait unit the units connect before placing them outside